For Public Elementary and Secondary Schools: Orientation and Workshop Seminar on Concepts , Principles and Practice Standards of Child-Centered Disaster Risk Reduction and Waste Management Posted on September 7, 2016 by marksherwinmagsombol Leave a comment 16-09-024. Orientation and Workshop Seminar on Concepts , Principles and Practice Standards of Child-Centered Disaster Risk Reduction and Waste Management Memorandum